Re: Why Ext2/3 needs immutable attribute?

[Kyle Moffett]

On Apr 23, 2005, at 12:50, dean gaudet wrote:
> On Sun, 17 Apr 2005, Xin Zhao wrote:
>
> > Why not simply unset the write bit for all three groups of users?
> > That seems to be enough to prevent file modification.
>
> another usage:  if you "chattr +i /var" while /var is unmounted, then 
> root
> is unlikely to accidentally create files/dirs in /var -- and when you
> mount the real /var on top it works fine.  i tend to protect all my 
> mount
> points this way (especially those in /mnt) to avoid my own dumb 
> mistakes.

If you chmod 000 /var beforehand (While it's still unmounted, of 
course),
then it's also blindingly obvious that it's not mounted in an ls -l :-D.
I too have used this trick on many/most of my systems.

Cheers,
Kyle Moffett

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